Casio cdp-230r sustain problem

i have a casio cdp-230r. Just recently it started making a buzzing sound that last about a second when you turn it on. And the sustain is always on. I tried unplugging the sustain pedal and nothing changes. It plays fine otherwise. Any help would be greatly appreciated.

Oh! Sorry Lakester. I mis-read your post thinking thr buzzing sound was the only issue with sustain on and sustain off.
Gary is on the ball.
I once had the same problem in an old discarded model. When I unplugged the sustain pedal it was silll in sustain mode using my headphones or external amp/speaker. When I unplugged the head phones and/or the amp/speaker the problem fixed itself playing through the keyboard speakers.(no sustain).Ray

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